27871 has 4 divisors (see below), whose sum is σ = 28512. Its totient is φ = 27232.

The previous prime is 27851. The next prime is 27883. The reversal of 27871 is 17872.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 27871 - 2⁷ = 27743 is a prime.

It is a Duffinian number.

27871 is a lucky number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 250 + ... + 343.

It is an arithmetic number, because the mean of its divisors is an integer number (7128).

2²⁷⁸⁷¹ is an apocalyptic number.

27871 is a deficient number, since it is larger than the sum of its proper divisors (641).

27871 is an equidigital number, since it uses as much as digits as its factorization.

27871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 640.

The product of its digits is 784, while the sum is 25.

The square root of 27871 is about 166.9460990859. The cubic root of 27871 is about 30.3191845888.

Subtracting from 27871 its reverse (17872), we obtain a palindrome (9999).

It can be divided in two parts, 27 and 871, that added together give a palindrome (898).

The spelling of 27871 in words is "twenty-seven thousand, eight hundred seventy-one".